Keith Bradford, the mind behind online hack hub 1000 Hacks, has just released Life Hacks, a book of simple tips for navigating all areas of life with a little more finesse—including under-the-radar tricks for getting cheap and free stuff. Here, Bradford shares 10 life hacks of the money-saving persuasion.

1. If you bought something on Amazon and the price goes down within 30 days, you can e-mail them and they will send you the difference.

2. For frequent Starbucks customers: Buy and use a membership card. It only takes five transactions to get to the green level, and then coffee and tea refills are free.

3. Buying a gym membership? Most times, your health insurance company will completely reimburse the cost for you.

4. When shopping online, search for promo codes on Google before making a purchase. You can usually find a variety of discounts from free shipping to 25% off.

5. If you have a gift card with less than $10 on it, the business is legally required to give you the rest of your balance in cash if you ask.

6. Buying a car? Buy it at the end of the month. Salespeople usually have quotas to meet and will be more likely to cut you a deal.

7. On the bottom of every Krispy Kreme receipt is a plea to fill out a survey. You get a free doughnut for doing the survey. When you get your doughnut, you get another receipt, with another survey. Free doughnuts for life!

8. When going over 40 mph, it is more economical to have the windows up and the AC on. While driving under 40 mph, the opposite is true.

9. When taking a cab somewhere unfamiliar to you, put your destination in your phone’s GPS. This way, it will be impossible for the driver to scam you.

10. When grocery shopping, the cheapest items will be on the top and bottom shelves, not at eye level.